/* ============================================================
   Impact Feature Space — design tokens
   Palette drawn from the instrument itself: the three sensor
   channels (x/y/z) that appear in every recorded waveform,
   plus an amber "armed" signal color and a violet "unconfirmed
   signal" color reserved for speculative content.
   ============================================================ */

:root{
  --bg: #17100A;
  --bg-raise: #1D150D;
  --surface: #241A10;
  --surface-2: #2C2013;
  --line: #4A3620;
  --line-soft: #332415;

  --ink: #F5E9D9;
  --ink-dim: #C7AC8A;
  --ink-faint: #8C6F52;

  --sig-x: #C2652E;   /* structural / linear channel — copper */
  --sig-x-dim: #5C3016;
  --sig-y: #9C7A3A;   /* coupling / rotational channel — bronze */
  --sig-y-dim: #4A3A18;
  --sig-z: #A8462B;   /* spectral channel — burnt sienna */
  --sig-z-dim: #4A2016;
  --amber: #E8A93E;   /* artefact / accent / armed */
  --amber-dim: #6B4E18;
  --violet: #8C6478;  /* speculative / unconfirmed signal */
  --violet-dim: #453038;

  --mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --disp: 'Space Grotesk', var(--sans);

  --maxw: 1180px;
  --radius: 14px;
  --radius-sm: 8px;
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; overflow-x: hidden; }
html, body{ margin:0; padding:0; }

body{
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size:17.5px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(ellipse 900px 500px at 12% -10%, rgba(232,169,62,0.09), transparent 60%),
    radial-gradient(ellipse 700px 500px at 100% 0%, rgba(194,101,46,0.10), transparent 55%);
  background-repeat: no-repeat;
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

::selection{ background: var(--amber); color: #1C1002; }

a{ color: inherit; text-decoration: none; }
img{ max-width: 100%; display:block; }

h1,h2,h3,h4{
  font-family: var(--disp);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0;
}

p{ margin: 0 0 1em; color: var(--ink-dim); }
p:last-child{ margin-bottom: 0; }

.wrap{ max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

.eyebrow{
  font-family: var(--mono);
  font-size:13.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 14px;
}
.eyebrow::before{
  content:"";
  width: 22px; height: 1px;
  background: var(--amber);
  display: inline-block;
  margin-top: 0.62em;
  flex-shrink: 0;
}
.eyebrow.x::before{ background: var(--sig-x); }
.eyebrow.y::before{ background: var(--sig-y); }
.eyebrow.z::before{ background: var(--sig-z); }
.eyebrow.v::before{ background: var(--violet); }
.eyebrow.n::before{ background: var(--ink-faint); }

/* ---------------- nav ---------------- */
.topnav{
  position: sticky; top: 0; z-index: 50;
  background: rgba(23,16,10,0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}
.topnav .wrap{
  display:flex; align-items:center; justify-content:space-between;
  height: 64px;
}
.brand{
  display:flex; align-items:center; gap:10px;
  font-family: var(--mono); font-weight:600; font-size:16.5px;
  color: var(--ink); letter-spacing: 0.02em;
}
.brand .dot-trace{ width: 26px; height: 16px; }
.navlinks{ display:flex; align-items:center; gap: 30px; }
.navlinks a{
  font-family: var(--mono); font-size:14px; color: var(--ink-dim);
  padding: 6px 2px; border-bottom: 1px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}
.navlinks a:hover{ color: var(--ink); }
.navlinks a.current{ color: var(--amber); border-color: var(--amber); }
.navtoggle{ display:none; }

@media (max-width: 780px){
  .navlinks{
    position: fixed; inset: 64px 0 0 0; height: calc(100vh - 64px);
    background: var(--bg); flex-direction: column; justify-content: flex-start;
    padding: 30px 28px; gap: 22px;
    transform: translateX(100%); visibility: hidden; transition: transform .25s ease, visibility 0s linear .25s;
  }
  .navlinks.open{ transform: translateX(0); visibility: visible; transition: transform .25s ease; }
  .navlinks a{ font-size:17.5px; }
  .navtoggle{
    display:flex; align-items:center; justify-content:center;
    width: 38px; height: 38px; border:1px solid var(--line); border-radius: 8px;
    background: transparent; color: var(--ink); cursor: pointer;
  }
}

/* ---------------- buttons ---------------- */
.btnrow{ display:flex; gap: 14px; flex-wrap: wrap; }
.btn{
  font-family: var(--mono); font-size:14.5px; letter-spacing: 0.02em;
  padding: 13px 22px; border-radius: 999px; display:inline-flex; align-items:center; gap:8px;
  border: 1px solid var(--line); transition: all .15s ease;
}
.btn.primary{ background: var(--amber); color: #1C1002; border-color: var(--amber); font-weight: 600; }
.btn.primary:hover{ background: #F2C066; }
.btn.ghost{ color: var(--ink); }
.btn.ghost:hover{ border-color: var(--ink-dim); background: var(--surface); }
.btn svg{ width: 13px; height: 13px; }

/* ---------------- layout helpers ---------------- */
section{ padding: 88px 0; border-bottom: 1px solid var(--line-soft); }
section.tight{ padding: 64px 0; }
section:last-of-type{ border-bottom: none; }
.section-head{ max-width: 680px; margin-bottom: 48px; }
.section-head h2{ font-size: clamp(28px, 3.6vw, 40px); margin-bottom: 14px; }
.section-head p{ font-size:18.5px; }

.grid{ display:grid; gap: 22px; }
.grid.cols-2{ grid-template-columns: 1fr 1fr; }
.grid.cols-3{ grid-template-columns: repeat(3, 1fr); }
.grid.cols-4{ grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px){
  .grid.cols-2, .grid.cols-3, .grid.cols-4{ grid-template-columns: 1fr; }
}

.card{
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.panel{
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* ---------------- stat strip ---------------- */
.statstrip{
  display:grid; grid-template-columns: repeat(3,1fr); gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: var(--radius);
  overflow:hidden;
}
.stat{ background: var(--bg-raise); padding: 30px 26px; }
.stat .num{ font-family: var(--mono); font-size: clamp(28px,3vw,38px); font-weight:600; letter-spacing: -0.01em; }
.stat .num small{ font-size: 0.5em; color: var(--ink-faint); font-weight: 500; }
.stat .cap{ margin-top: 8px; font-size:14.5px; color: var(--ink-dim); line-height: 1.45; }
.stat.x .num{ color: var(--sig-x); }
.stat.y .num{ color: var(--sig-y); }
.stat.z .num{ color: var(--sig-z); }
@media (max-width: 780px){ .statstrip{ grid-template-columns: 1fr; } }

/* ---------------- domain cards ---------------- */
.domain-card{
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 26px;
  border-top: 3px solid var(--c, var(--amber));
}
.domain-card .tag{
  font-family: var(--mono); font-size:13px; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--c, var(--amber)); margin-bottom: 10px; display:block;
}
.domain-card h3{ font-size:20.5px; margin-bottom: 10px; }
.domain-card p{ font-size:16px; }
.domain-card.x{ --c: var(--sig-x); }
.domain-card.y{ --c: var(--sig-y); }
.domain-card.z{ --c: var(--sig-z); }
.domain-card.a{ --c: var(--amber); }
.domain-card.v{ --c: var(--violet); }
.domain-card.n{ --c: var(--line); }
.domain-card.n .tag{ color: var(--ink-faint); }

/* ---------------- readout table (measures) ---------------- */
.readout{ border-top: 1px solid var(--line); margin-top: 18px; }
.readout-row{
  display:grid; grid-template-columns: 220px 1fr; gap: 22px;
  padding: 16px 0; border-bottom: 1px solid var(--line);
}
.readout-row .m-name{ font-family: var(--mono); font-size:14.5px; color: var(--ink); }
.readout-row .m-desc{ font-size:15.5px; color: var(--ink-dim); }
@media (max-width: 700px){
  .readout-row{ grid-template-columns: 1fr; gap: 6px; }
}

/* ---------------- figure frames (light "screen" for the real plots) ---------------- */
.scope{
  background: #F7F1E6;
  border-radius: var(--radius-sm);
  padding: 18px;
  border: 1px solid var(--line);
}
.scope img{ border-radius: 4px; }
figure{ margin: 0; }
figcaption{
  font-family: var(--mono); font-size:13.5px; color: var(--ink-faint);
  margin-top: 12px; line-height: 1.5;
}
figcaption b{ color: var(--ink-dim); }

/* ---------------- results table ---------------- */
table.results{ width:100%; border-collapse: collapse; font-size:16px; }
table.results th, table.results td{ text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); }
table.results th{ font-family: var(--mono); font-size:13px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.06em; font-weight: 500; }
table.results td{ color: var(--ink-dim); }
table.results td.hi{ color: var(--ink); font-family: var(--mono); }
table.results tr:last-child td{ border-bottom: none; }

/* ---------------- callout / banner ---------------- */
.banner{
  border: 1px dashed var(--violet);
  background: linear-gradient(180deg, rgba(140,100,120,0.08), rgba(140,100,120,0.02));
  border-radius: var(--radius);
  padding: 22px 26px;
  display:flex; gap: 16px; align-items: flex-start;
}
.banner .ico{ color: var(--violet); flex-shrink:0; margin-top: 2px; }
.banner strong{ color: var(--ink); }
.banner p{ font-size:16px; color: var(--ink-dim); margin:0; }

.note{
  border-left: 2px solid var(--line);
  padding-left: 18px; font-size:16px; color: var(--ink-dim);
}

/* ---------------- hypothesis card (applications) ---------------- */
.hypo-card{
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 28px;
  position: relative;
}
.hypo-card .tag{
  display:inline-flex; align-items:center; gap:6px;
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--violet); background: rgba(140,100,120,0.12);
  border: 1px solid var(--violet-dim); border-radius: 999px;
  padding: 5px 12px; margin-bottom: 16px;
}
.hypo-card.amber .tag{ color: var(--amber); background: rgba(232,169,62,0.12); border-color: var(--amber-dim); }
.hypo-card.question .tag{ color: var(--violet); background: rgba(140,100,120,0.12); border-color: var(--violet-dim); }

/* ---------------- draft-preview banner (dry-run only) ---------------- */
.draft-banner{
  position: sticky; top: 64px; z-index: 40;
  background: repeating-linear-gradient(135deg, #4A2E1A, #4A2E1A 12px, #3A2414 12px, #3A2414 24px);
  border-bottom: 1px solid var(--amber-dim);
  color: #F5E9D9; font-family: var(--mono); font-size: 13px; text-align: center;
  padding: 9px 20px;
}
.draft-banner strong{ color: var(--amber); }

/* ---------------- flow chain (mechanical transfer diagrams) ---------------- */
.flowchain{
  display:flex; align-items:center; flex-wrap:wrap; gap: 10px;
  font-family: var(--mono); font-size: 13.5px;
}
.flowchain .fstep{
  background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 10px 16px; color: var(--ink);
}
.flowchain .farrow{ color: var(--ink-faint); font-size: 16px; }
@media (max-width: 700px){
  .flowchain{ flex-direction: column; align-items: flex-start; }
  .flowchain .farrow{ transform: rotate(90deg); margin-left: 8px; }
}

/* ---------------- boundary table (defensible / not defensible) ---------------- */
table.boundary{ width:100%; border-collapse: collapse; font-size: 14.5px; }
table.boundary th{
  text-align:left; padding: 12px 16px; font-family: var(--mono); font-size: 12px;
  text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-faint); font-weight: 500;
  border-bottom: 1px solid var(--line);
}
table.boundary td{ padding: 14px 16px; vertical-align: top; border-bottom: 1px solid var(--line-soft); color: var(--ink-dim); }
table.boundary td:first-child{ border-right: 1px solid var(--line-soft); }
table.boundary tr:last-child td{ border-bottom: none; }
.hypo-card h3{ font-size:21.5px; margin-bottom: 10px; }
.hypo-card p{ font-size:16px; }

/* ---------------- footer ---------------- */
footer{ padding: 56px 0 40px; }
footer .fgrid{ display:grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; }
footer h4{ font-family: var(--mono); font-size:13px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-faint); margin-bottom: 14px; font-weight: 500; }
footer p, footer a{ font-size:14.5px; color: var(--ink-dim); }
footer ul{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap: 10px; }
footer a:hover{ color: var(--ink); }
.footbottom{
  margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--line-soft);
  display:flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-family: var(--mono); font-size:13px; color: var(--ink-faint);
}
@media (max-width: 780px){ footer .fgrid{ grid-template-columns: 1fr; } }

/* ---------------- misc ---------------- */
.kicker-divider{ height: 22px; margin: 0 auto; opacity: .55; }
.tagline-lg{ font-size:20.5px; color: var(--ink); font-family: var(--disp); font-weight: 500; }
.mono{ font-family: var(--mono); }
.two-col-text{ display:grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
@media (max-width: 900px){ .two-col-text{ grid-template-columns: 1fr; gap: 24px; } }

.pill{
  display:inline-flex; align-items:center; gap:6px;
  font-family: var(--mono); font-size: 12.5px; letter-spacing:0.05em;
  border-radius: 999px; padding: 4px 11px; border: 1px solid var(--line);
  color: var(--ink-dim);
}

.reveal{ opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in{ opacity: 1; transform: translateY(0); }

/* ---------------- forms ---------------- */
.form-group{ margin-bottom: 22px; }
.form-group label{
  display:block; font-family: var(--mono); font-size:14px; color: var(--ink-dim);
  margin-bottom: 8px; letter-spacing: 0.02em;
}
.form-group .optional{ color: var(--ink-faint); font-weight: 400; }
input[type="text"], input[type="email"], textarea{
  width: 100%; background: var(--bg-raise); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 13px 15px; color: var(--ink);
  font-family: var(--sans); font-size: 16px; line-height: 1.5;
  transition: border-color .15s ease; box-sizing: border-box;
}
input[type="text"]:focus, input[type="email"]:focus, textarea:focus{
  outline: none; border-color: var(--amber);
}
textarea{ min-height: 150px; resize: vertical; }
.captcha-row{ display:flex; align-items:center; gap: 14px; flex-wrap: wrap; }
.captcha-q{
  font-family: var(--mono); font-size: 16px; color: var(--ink);
  background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 12px 16px; user-select: none;
}
.captcha-row input[type="text"]{ max-width: 110px; }
.form-error{
  color: var(--sig-z); font-size: 14px; margin-top: 10px; display:none;
}
.form-note{ font-size: 13px; color: var(--ink-faint); margin-top: 8px; }
.hp-field{
  position: absolute; left: -9999px; top: -9999px; height: 0; width: 0;
  opacity: 0; overflow: hidden; pointer-events: none;
}
.form-submit-row{ display:flex; align-items:center; gap: 18px; flex-wrap: wrap; margin-top: 6px; }
button.btn.primary{
  font: inherit; font-family: var(--mono); cursor: pointer; border: 1px solid var(--amber);
}

/* ---------------- language switcher (minimal, 2 languages for now) ---------------- */
.nav-right{ display:flex; align-items:center; gap: 26px; }
.nav-right .fullsite-link{ font-family:var(--mono); font-size:13px; color:var(--ink-dim); white-space:nowrap; }
@media (max-width: 560px){
  .nav-right .fullsite-link{ display:none; }
  .nav-right{ gap: 10px; }
}
.lang-switch{ display:flex; align-items:center; gap: 6px; font-family: var(--mono); font-size: 13px; }
.lang-switch a, .lang-switch span{ padding: 3px 6px; border-radius: 5px; }
.lang-switch a{ color: var(--ink-dim); }
.lang-switch a:hover{ color: var(--ink); background: var(--surface-2); }
.lang-switch .current{ color: var(--amber); font-weight: 600; }
.lang-switch .sep{ color: var(--ink-faint); }

/* ---------------- condensed / summary pages ---------------- */
.summary-list{ display:flex; flex-direction:column; gap: 0; }
.summary-item{
  display:grid; grid-template-columns: 200px 1fr; gap: 20px;
  padding: 18px 0; border-bottom: 1px solid var(--line-soft);
}
.summary-item .num{ font-family: var(--mono); font-size: 13px; color: var(--ink-faint); }
.summary-item h4{ font-family: var(--disp); font-size: 17px; margin: 2px 0 4px; color: var(--ink); }
.summary-item p{ font-size: 14.5px; margin:0; }
@media (max-width: 700px){
  .summary-item{ grid-template-columns: 1fr; gap: 4px; }
}

/* ---------------- video embed ---------------- */
.video-wrap{
  position: relative; padding-top: 56.25%; height: 0;
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); background: var(--surface);
}
.video-wrap iframe{ position:absolute; inset:0; width:100%; height:100%; border:0; }
.video-note{ font-family: var(--mono); font-size: 13px; color: var(--ink-faint); margin-top: 14px; }
.link-card{
  display:block; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); padding: 22px; transition: border-color .15s ease, background .15s ease;
}
.link-card:hover{ border-color: var(--ink-faint); background: var(--surface-2); }
.link-card h4{ font-size: 17px; margin: 0 0 6px; color: var(--ink); font-family: var(--disp); }
.link-card p{ font-size: 14px; margin: 0; color: var(--ink-dim); }

/* ---------------- timeline ---------------- */
.timeline{ position:relative; padding-left:44px; max-width:820px; }
.timeline::before{
  content:""; position:absolute; left:9px; top:6px; bottom:6px; width:1px;
  background: linear-gradient(180deg, var(--line) 0%, var(--line) 100%);
}
.tl-item{ position:relative; padding-bottom:52px; }
.tl-item:last-child{ padding-bottom:0; }
.tl-dot{
  position:absolute; left:-44px; top:5px; width:10px; height:10px; border-radius:50%;
  background: var(--c, var(--amber));
  box-shadow: 0 0 0 5px var(--bg), 0 0 0 6px var(--line);
}
.tl-year{
  font-family: var(--mono); font-size:14.5px; color: var(--c, var(--amber));
  letter-spacing: 0.04em; margin-bottom: 8px; display:flex; align-items:center; gap:10px;
}
.tl-year .span{ color: var(--ink-faint); font-size:13px; }
.tl-item h3{ font-size:21.5px; margin-bottom: 10px; }
.tl-item p{ font-size:16px; max-width: 700px; }
.tl-item.x{ --c: var(--sig-x); }
.tl-item.y{ --c: var(--sig-y); }
.tl-item.z{ --c: var(--sig-z); }
.tl-item.a{ --c: var(--amber); }
.tl-item.v{ --c: var(--violet); }

.pullquote{
  font-family: var(--disp); font-weight: 500; font-size: clamp(20px,2.4vw,28px);
  color: var(--ink); line-height: 1.35; max-width: 760px;
  border-left: 3px solid var(--amber); padding-left: 24px; margin: 8px 0;
}
.pullquote.x{ border-color: var(--sig-x); }
.pullquote.y{ border-color: var(--sig-y); }
.pullquote.z{ border-color: var(--sig-z); }
.pullquote.v{ border-color: var(--violet); }

/* ---------------- references / bibliography ---------------- */
.reflist{ counter-reset: refnum; }
.refitem{
  display:grid; grid-template-columns: 44px 1fr; gap: 16px;
  padding: 16px 0; border-bottom: 1px solid var(--line-soft);
  font-size:15.5px; color: var(--ink-dim); line-height: 1.55;
}
.refitem:first-child{ border-top: 1px solid var(--line-soft); }
.refnum{ font-family: var(--mono); color: var(--ink-faint); font-size:14px; }
.refitem b, .refitem strong{ color: var(--ink); font-weight: 500; }
.refitem em{ color: var(--ink-dim); }
.refitem a{ color: var(--sig-z); text-decoration: underline; text-underline-offset: 2px; }
.refitem a:hover{ color: var(--ink); }
.refgroup-title{
  font-family: var(--mono); font-size:13.5px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-faint); margin: 48px 0 4px;
}
.refgroup-title:first-of-type{ margin-top: 0; }